OUR PART # XL-B3
The XL-B3 from Sound Devices is a is a Sony® compatible L-Series replacement battery pack, which may be used with the Sound Devices 633 mixer or 7-Series audio recorders, the Video Devices PIX 240i camera-mount video recorder, and the Video Devices PIX-E Series of 4K recording monitors.
It may be used as the primary power source or as an onboard backup power supply.
Unlike Ni-Cad and NiMh batteries, the XL-B3 Lithium Ion battery pack does not have to be fully discharged before charging; however, it will naturally discharge itself over time. It is best to charge it the day before or same day you plan to use it.